Greek youths clash with police for 2nd day

An Anarchist walks in front of burning trash during clashes in Athens on Sunday, Dec. 6, 2009. Protesters hurled rocks and burning garbage at police as violence erupted during a march to mark the first anniversary of the police shooting of a teenager, whose death sparked massive riots. Police fired tear gas at scores of hooded youths in central Athens, as several thousand demonstrators marched to commemorate the death of 15-year-old Alexandros Grigoropoulos.(AP Photo/Petros Giannakouris)
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An Anarchist walks in front of burning trash during clashes in Athens on Sunday, Dec. 6, 2009. Protesters hurled rocks and burning garbage at police as violence erupted during a march to mark the first anniversary of the police shooting of a teenager, whose death sparked massive riots. Police fired tear gas at scores of hooded youths in central Athens, as several thousand demonstrators marched to commemorate the death of 15-year-old Alexandros Grigoropoulos.(AP Photo/Petros Giannakouris)
/ AP

Protestors throw stones at riot police during clashes in Athens, Sunday, Dec. 6, 2009. Protesters hurled rocks and burning garbage at police as violence erupted during a march to mark the first anniversary of the police shooting of a teenager, whose death sparked massive riots. Police fired tear gas at scores of hooded youths in central Athens, as several thousand demonstrators marched to commemorate the death of 15-year-old Alexandros Grigoropoulos. (AP Photo/Petros Giannakouris)— AP

Protestors throw stones at riot police during clashes in Athens, Sunday, Dec. 6, 2009. Protesters hurled rocks and burning garbage at police as violence erupted during a march to mark the first anniversary of the police shooting of a teenager, whose death sparked massive riots. Police fired tear gas at scores of hooded youths in central Athens, as several thousand demonstrators marched to commemorate the death of 15-year-old Alexandros Grigoropoulos. (AP Photo/Petros Giannakouris)
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Rocks and debris litter a street during clashes in Athens, Sunday, Dec. 6, 2009. Protesters hurled rocks and burning garbage at police as violence erupted during a march to mark the first anniversary of the police shooting of a teenager, whose death sparked massive riots. Police fired tear gas at scores of hooded youths in central Athens, as several thousand demonstrators marched to commemorate the death of 15-year-old Alexandros Grigoropoulos. (AP Photo/Petros Giannakouris)— AP

Rocks and debris litter a street during clashes in Athens, Sunday, Dec. 6, 2009. Protesters hurled rocks and burning garbage at police as violence erupted during a march to mark the first anniversary of the police shooting of a teenager, whose death sparked massive riots. Police fired tear gas at scores of hooded youths in central Athens, as several thousand demonstrators marched to commemorate the death of 15-year-old Alexandros Grigoropoulos. (AP Photo/Petros Giannakouris)
/ AP

A protestor throws stones at riot police during clashes in Athens, Sunday, Dec. 6, 2009. Protesters hurled rocks and burning garbage at police as violence erupted during a march to mark the first anniversary of the police shooting of a teenager, whose death sparked massive riots. Police fired tear gas at scores of hooded youths in central Athens, as several thousand demonstrators marched to commemorate the death of 15-year-old Alexandros Grigoropoulos. (AP Photo/Petros Giannakouris)— AP

A protestor throws stones at riot police during clashes in Athens, Sunday, Dec. 6, 2009. Protesters hurled rocks and burning garbage at police as violence erupted during a march to mark the first anniversary of the police shooting of a teenager, whose death sparked massive riots. Police fired tear gas at scores of hooded youths in central Athens, as several thousand demonstrators marched to commemorate the death of 15-year-old Alexandros Grigoropoulos. (AP Photo/Petros Giannakouris)
/ AP

Riot police detain a suspected rioter during clashes in Athens, Sunday, Dec. 6, 2009. Protesters hurled rocks and burning garbage at police as violence erupted during a march to mark the first anniversary of the police shooting of a teenager, whose death sparked massive riots. Police fired tear gas at scores of hooded youths in central Athens, as several thousand demonstrators marched to commemorate the death of 15-year-old Alexandros Grigoropoulos. (AP Photo/Petros Giannakouris)— AP

Riot police detain a suspected rioter during clashes in Athens, Sunday, Dec. 6, 2009. Protesters hurled rocks and burning garbage at police as violence erupted during a march to mark the first anniversary of the police shooting of a teenager, whose death sparked massive riots. Police fired tear gas at scores of hooded youths in central Athens, as several thousand demonstrators marched to commemorate the death of 15-year-old Alexandros Grigoropoulos. (AP Photo/Petros Giannakouris)
/ AP

A protestor throws stones at riot police during clashes in Athens, Sunday, Dec. 6, 2009. Protesters hurled rocks and burning garbage at police as violence erupted during a march to mark the first anniversary of the police shooting of a teenager, whose death sparked massive riots. Police fired tear gas at scores of hooded youths in central Athens, as several thousand demonstrators marched to commemorate the death of 15-year-old Alexandros Grigoropoulos. (AP Photo/Petros Giannakouris)— AP

A protestor throws stones at riot police during clashes in Athens, Sunday, Dec. 6, 2009. Protesters hurled rocks and burning garbage at police as violence erupted during a march to mark the first anniversary of the police shooting of a teenager, whose death sparked massive riots. Police fired tear gas at scores of hooded youths in central Athens, as several thousand demonstrators marched to commemorate the death of 15-year-old Alexandros Grigoropoulos. (AP Photo/Petros Giannakouris)
/ AP

ATHENS, Greece 
Masked youths smashed store windows and hurled rocks and firebombs at riot police who responded with tear gas Monday in a second day of violence during commemorations of last year's fatal police shooting of a teenager.

The death last year of 15-year-old Alexis Grigoropoulos led to some of the worst rioting Greece had ever seen, with gangs of youths smashing, looting and burning stores in cities across the country for two weeks, protesting heavy-handed police tactics.

Monday's clashes broke out during a demonstration by about 3,000 people, mostly high-school students, through the center of Athens. Several dozen youths at the tail end of the march attacked riot police with rocks, firebombs and firecrackers, smashing some of the bus stops, telephone booths and storefronts not damaged in Sunday's demonstration.

Protesters injured a passer-by who attempted to intervene, beating the middle-aged man unconscious. Police detained at least three youths.

Some demonstrators tried to prevent clashes, shouting at the groups of youths instigating the violence, but to little avail.

"I'm here to play at beating up the police. What's your problem?" one young rioter retorted to a student who admonished him for causing trouble.

Demonstrators also scrawled anti-police graffiti and stenciled a photograph of Grigoropoulos on store windows and walls along the demonstration route.

Minor clashes also broke out during a march of about 2,000 people in Greece's second-largest city of Thessaloniki to the north, where riot police fired tear gas to disperse youths pelting them with rocks.

Police said Monday that 780 people had been detained for public order offenses in connection with the demonstrations across Greece during the 48 hours from Saturday until early Monday. Five demonstrators and 16 police were injured in Athens during Sunday's demonstration - including a woman who was seriously hurt when she was struck by a police officer who lost control of his motorbike as he charged into the capital's central Syntagma Square.

Government spokesman Giorgos Petalotis said Monday that the police officer involved was under investigation, and had visited the injured woman in hospital.

Still, the two-day violence was far more limited than the extensive riots that gripped the country last year immediately after Grigoropoulos' death. The new Socialist government, which was voted into power in early October, had vowed a zero tolerance approach to troublemakers during this year's demonstrations.

"Those seeking a repeat (of 2008) did not achieve their aim," Petalotis said. "The message is that the cities where protests took place are not defenseless. ... The process of police detention is legal."

On Sunday night, Civil Protection Minister Michalis Chrisochoidis defended tougher tactics used by police, despite criticism from a left-wing opposition party that said the government's response had been heavy-handed.

"Police detentions, when justified, are not illegal in a democratic society. Neither is it illegal for judicial officials to press charges," the minister said. "Vandals and hooligans have nothing to do with democracy."

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Associated Press writers Derek Gatopoulos in Athens and Costas Kantouris in Thessaloniki contributed to this report.